Calling Subclass Method in Java

Posted by destructo_gold on Stack Overflow See other posts from Stack Overflow or by destructo_gold
Published on 2010-03-26T09:18:41Z Indexed on 2010/03/26 9:23 UTC
Read the original article Hit count: 301

Filed under:

polymorphism

|

inheritance

|

java

Given the following situation (UML below),

If Y has the method:

public void PrintWs();

and X has:

ArrayList <P> myPs = new ArrayList();

Y y = new Y();
Z z = new Z();
myPs.add(y);
myPs.add(z);

How do I loop through each myPs object and call all Ys PrintWs (without using instanceof)?

http://starbucks.mirror.waffleimages.com/files/68/68c26b815e913acd00307bf27bde534c0f1f8bfb.jpg

© Stack Overflow or respective owner

Related posts about polymorphism

What is Polymorphism?

as seen on Samir ASP.NET with C# Technology - Search for 'Samir ASP.NET with C# Technology'
* Polymorphism is one of the primary characteristics (concept) of object-oriented programming. * Poly means many and morph means form. Thus, polymorphism refers to being able to use many forms of a type without regard to the details. * Polymorphism is the characteristic of being able to… >>> More
Where did the "Polymorphism" word come from?

as seen on Stack Overflow - Search for 'Stack Overflow'
I've always wondered where did the word "Polymorphism" word come from. I know what is polymorphism and I use it of course, but I just don't understand why this technique called polymorphism. Note that I'm not a native English speaker, and I will thank you if you'll use simple English in your answers… >>> More
Virtual functions and polymorphism

as seen on Stack Overflow - Search for 'Stack Overflow'
Suppose I have this: class A { public: virtual int hello(A a); }; class B : public A { public: int hello(B b){ bla bla }; }; So, A it's an abstract class. 1)In the class B, I'm defining a method that its suppose overrides the A class. But the parameter it's slightly different. I'm… >>> More
Classes, methods, and polymorphism in Python

as seen on Stack Overflow - Search for 'Stack Overflow'
I made a module prototype for building complex timer schedules in python. The classe prototypes permit to have Timer objects, each with their waiting times, Repeat objects that group Timer and other Repeat objects, and a Schedule class, just for holding a whole construction or Timers and Repeat instances… >>> More
Is Polymorphism and Method Overloading is almost the same thing in C++

as seen on Stack Overflow - Search for 'Stack Overflow'
In C++, there are 2 types of Polymorphism: Object Polymorphism Function Polymorphism Function polymorphism is exactly the same thing as method or function overloading i.e. We use the same method names with different parameters and return types. Now the question is why do we have this fancy name… >>> More

Related posts about inheritance

Single Table Inheritance (Database Inheritance design options) pros and cons and in which case it us

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I study about today about 2 database design inheritance approaches: 1. Single Table Inheritance 2. Class Table Inheritance In my student opinion Single Table Inheritance make database more smaller vs other approaches because she use only 1 table. But i read that the more favorite approach… >>> More
How to use Private Inheritence aka C++ in C# and Why not it is present in C#

as seen on Stack Overflow - Search for 'Stack Overflow'
I know that private inheritance is supported in C++ and only public inheritance is supported in C#. I also came across an article which says that private inheritance usually defines a HAS-A relationship and kind of an aggregation relationship between the classes. EDIT: C++ code for private inheritance: The… >>> More
[PHP] Singleton class and using inheritance

as seen on Stack Overflow - Search for 'Stack Overflow'
I have am working on a web application that makes use of helper classes. These classes hold functions to various operation such as form handling. Sometimes I need these classes at more than one spot in my application, The way I do it now is to make a new Object. I can't pass the variable, this will… >>> More
Difference between Inheritance and Composition

as seen on Stack Overflow - Search for 'Stack Overflow'
Are Composition and Inheritance are the same? If I want to implement the composition pattern, how can I do that in Java? >>> More
C# Interface Inheritance (Basics)

as seen on Stack Overflow - Search for 'Stack Overflow'
Why does the following produce a compiler error: public interface OwnSession : ISession { } [...] OwnSession s = SessionFactory.OpenSession(); // compiler error (in german unfortunately) [...] "SessionFactory" returns a "ISession" on "OpenSession()" (NHibernate) >>> More